Briones Regional Park ~ East Sa Y Regional Park District
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1981 RESOURCE ANALYSIS / . " MANAGEMENT P'LAN ___d - ..-..-'--- ."--- '. _.' -: ....... · .. ·-.. · __ .....;.r~- ... -.. ' .~~.- " -:;~"""''::-.~'''- ._......... >1 ..... .... 7. • "'._........ : .... .....-'1.... ...-;-"7 '" •••~..;~/j, .... -~-...:"..~ .-.-~ .... ,,;.: ..•.. ~ ... -.-- -._--------- ., BRIONES REGIONAL PARK ~ EAST SA Y REGIONAL PARK DISTRICT BRIONES REGIONAL PARK RESOURCE ANALYSIS Adopted: September 22, 1981 Resolution No: 1981-9-262 Prepared by: East Bay Regional Park District 2950 .Peralta Oaks Court Oakland, CA 94605 (510) 635-0135 .... TABLE OF CONTENTS - continued PAGE VII. REPORT PREPARATION AND PERSONS CONTACTED 84 A. REPORT PREPARATION 84 B. PERSONS' CONTACTED 85 VIII. BIBLIOGRAPHY- FIGURE I. C-l: LOCATION 5 '.. FIGURE I. D-2 : AER~ PHOTOGRAPH 6 FIGURE I. E-l: MAJOR FEATURES· AND PARK NAMES 7 FIGURE III. :8-1: MASTER PLAN UNITS 14 FIGURE tV. A-I: TOPOGRAPHY 19 FIGliM tV. A-2: ASPECT 20 FIGIJRE IV. A-3: SLOPE' 21 FIGURE IV. A-4: GEOLOGY 22 FIGURE IV. A-5: GEtiLOGIC CROSS~SECTIONS 23 FIGURE IV. A-6: LANDSLIDE SUSCEPTIBILITY 24 FIGURE IV. A-7: BEDROCK DEPTH 25 FIQURE IV. A-8: EROSIO:N 26 FIGURE IV. B-1: HYDROLOGY 27 FIGURE IV. F-l: VEGETATION 44 FIGtmE IV. F-2: GRASSLAND MANAGEMENT STRATA 53 FIGURE IV. H-l: RANGE CAPABILITY 64 FIGUlm IV. I-I: wiLDFIRE-REST 'WIND 68 FIGURE IV. 1-2: WILDFlRE-NORTHEAST WIND 68 FIGURE IV. K-l: ARCHAEOLOGY -71 FIGURE V. A-I: IMPROVEHENTS 75 FIGUlm V. A-2: ROAD CROSS SECTIONS 77 FIGURE V. B-1: POTENTIAL DEVELOPMENT SITES 79 FlGURE VI. A-I: ACQUISITION 81 . TABLES TABLE IV. A-I: SOIL PROFILES 24 TABLE IV. B.... l: WATERSHEDS 28 TABLE IV. B"..2: AVERAGE MONTHLY FLOWS. FOR BEAR CREEK AT CONFLUENCE WITH BRIONES RESERVOIR 29 TABLE IV. C-l: SURFACE'WATER QUALITY 36 TABLE IV. C-2: GROl,JNDWAT}';R AND SPRING WATER QUALITY 37 TABLE IV. C-3: TEST WELLS .JfAT.ER QUALITY 38 TABLE IV. D-l: SUMMARY OF FREQUENCY OF WIND DIRECTION 40 TABLE IV. H-l: RANGE USE COMPARISON RAtIOS 64 ii 1981 RESOURCE SUMMARY SHEET BRIONES REGIONAL PARK INVENTORY LOCATION: Contra Costa County USGS QUAD: Briones Valley; Walnut Creek ACCESS: Bear Creek Rd. (west); Reliez Valley Rd. (east); Alhambra Valley Rd. (north~ SIZE: 5200 acres ELEVATION: 300-1483 feet TOPOGRAPHY: steep hills SLOPES: 0 to 75+% ROCK: sandstone; shale SOILS: clay-loam; loam CREEKS/WATERSHEDS: Ahrigo; Alexander; Alhambra; Bear; Blum; Bullseye; Grayson; Lafayette; Panorama; Reliez; Russell; Springhill; Toyon OTHER WATER: four lagoons; two cattle ponds; 13+ springs AVERAGE TEMPERATURE: 300 -1050 AIR QUALITY: Good ANNUAL PRECIPITATION: 21-25" VEGETATION: grassland; coastal brush; chaparral; oak savannah; oak woodland ; mixed hardwood/riparian forest RANGE 3000 ADM; ENDANGERED SPECIES: 3 plants; 2 animals ARCHAEOLOGY: Castanoan and Miwok hunting use HISTORY: Spanish rancho IMPROVEMENTS: two staging units; one recreation area; two group camps; internal road and trail system (46 miles); fences (over 4000 feet); corporation yard; two houses; 365 parking spaces; 20+ picnic tables; one water well; two developed springs; and 10+ chemical toilets. MANAGEMENT Topography is the major factor in Briones resource management. It defines watersheds for management of water and soils; influences vegetation and wildfire hazard; provides visual and accoustical isolation; and limits development of access roads and trails, utilities and facilities. Major resource management goals include: general land stewardship; provision of road and trail access; erosion control; - parkland water development to support wildlife, grazing, and visitor use; protection and restoration of diverse native vegetation and wildlife; continued use of range for grazing; protection of paleoenthological (fossil) and potential archaeological resources; control of noise and visual degradation; and control of wildfire. MASTER PLAN UNITS Over 90 percent of the Park is designated as in "Natural Unit". This area includes seven "Special Protection Units" and several proposed "Educational Use Units" which recognize unusual or sensitive natural or cultural resources, such as fossils, lagoons, wildflower area, creek (riparian) corridors, high-value wildlife habitat, viewpoints, or visually isolated areas. The remainder of the Park is designated as "Recreation/Staging Unit" which could be developed. ADMINISTRATION The Resource Analysis/Management Plan is adopted and amended by the Board of Directors. Under the zone manager, the Park supervisor will implement the }~nagement Plan with the District resource specialists. The Plan will be reviewed annually and revised each 5 'years. iii I. INTRODUCTION .", A. EAST BAY REGIONAL PARK DISTRICT The East Bay Regional Park District (henceforth referred to as the District or EBRPD) is a special district created by the State of California in 1934 covering area of approximately 1100 square miles within Contra Costa and Alameda Counties. The District owns approximately 53,000 acres of parks, wilderness, shoreline~, pres~rves, and recreation areas. The purpose of the District shall be to "acquire, develop and operate regional parklands in perpetuity for public use ~nd shall conserve these lands for the purpose of making the outdoor environment available for the enjoyment and education of the general pubiic." (District Master Plan, page 7) . B. DISTRICT MASTER PLAN RESOURCE POLICIES AND OBJECTIVES In order to provide direction for fulfilling the District's proper role in the community, the Board of Directors adopted a Master Plan in 1973 with revisions in 1980 listing the objectives necessary to accomplish the District's purpose. These objectives are intended to provide the public, the District Board of Directors and staff, and other governmental agencies with a clear statement of general District policies and objectives. The following excerpts from the District Master Plan deal with the District planning sequence and resource policies: . OVERALL DISTRICT OBJECTIVES "To provide a diversified land and water system of regional parks, recreation areas, wilderness, preserves, trails and shorelines and parkland related services which will provide District residents with opportunities for creative use of outdoor leisure time. 1 "Tp acquire, preserve and interpret significant examples of the natural environment, including biologic, geologic, scenic, and outdoor historic resources which exist within the boundaries of the District. "To emphasis balance of both environmental concerns and regional recreation opportunities within the system of parklands operated by the District. 1I (Page 7t RESOURCE ANALYSIS/MANAGEMENT PLAN AND THE PLANNING SEQUENCE Planning Sequence The Resource Analysis/Management Plan is the second step in a four step planning sequence recommended in the District Master Plan (Page 28). The four steps are: 1. Prepare an aquisition evaluation of each property before acquisition. 2. Prepare a resource analysis which contains a resource (e.g. vegetation, wildlife, and water) management plan. 3. Prepare a land use-development plan based on the resource analysis. 4. Prepare capital development plans. ReSource Analysis/Management Plan According to the Master Plan: IIAfter a parkland site has been acquired by the District and prior to the development of a land use plan, the District will complete a resource analysis which will identify features of the parkland which have significant resource value as well as provide a potential plan for vegetation and wildlife . management. Where an aquatic element is involved, a water management plan will be included. Guidelines will be established to be used in later planning processes to protect significant natural resources which could be adversely affected by parkland use." (Page, 28) Since the most recent rev~s~on of the Master Plan (1980), the District 'has begun an effort to implement the Master Plan by assigning every <1rea 2 of parkland one of four Master Plan l1units" based on resources, educational use, and potential recreational use. The four types Master Plan units are referred to on pages 28, 33, and 34 of the Master Plan, and are: natural area units; special (resource) protection units; educational use units; and recreation/staging (developable areas) units. Recreation/Staging, Natural, and Special Protection Master Plan Units for Briones and unit management have been determined in this document. Educational Use Units are suggested, but will be established by the Board following recommendations by the District Educational Use Committee. OTHER RESOURCE POLICIES IN THE MASTER PLAN The District Master Plan addresses many resource-related issues and establishes policies for resource management in Chapter V. Relevant sections of this Chapter have been repeated here for the convenience of the reader of this document. Special Protection Units "There may be areas within all parkland classifications which contain outstanding natural features, rare or endangered plant and animal species and their supporting ecosystems, significant geological, topographical (hydrologic, visual) features (archaeological sites) or have structures of historical significance. "Because of the unique and potentially fragile nature of these areas, Special Protective Zones (Units) shall be identified in the Resource Analysis and designated in the Land-Use Development Plans for each parkland. The primary objective of these Special Protection Zones (Units) is the preservation and enhancement of significant resources. Development within the Special Protection Zone (Units) shall be held to the minimum required for public safety protection and enhancement